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LangChain4j

RAG Frameworks

Verified Publisher·Pending reviewVerified Adoption·Pending reviewEnterprise Ready·Pending review

Java framework for integrating LLMs, RAG pipelines, tools, and agent workflows into JVM applications.

Developer decision brief

Should I use LangChain4j?

Java framework for integrating LLMs, RAG pipelines, tools, and agent workflows into JVM applications.

Open sourceDocs linked

Best for

Evaluate for a company
Enterprise evaluation details

Enterprise fit

Buyer brief for procurement and architecture review

Source-labeled signals for cost, reliability, security, integration, and adoption proof. Missing compliance evidence is shown as a gap, not guessed.

Compare for enterpriseExport brief

Events / Tours

LangChain4j developer events

Hackathons, workshops, office hours, launches, and partner challenges tied to this product.

Claim or partner

No public events yet

Claimed teams can add hackathons, webinars, office hours, and challenges, then measure attendee to usage ROI.

Quickstart

Preparing LangChain4j docs pack
Streaming

The product profile is ready. Official docs, README snippets, and the AI paste pack are loading in the background.

Build context

Developer projects using LangChain4j

No public community builds yet. These starter examples are templates, not fabricated activity.

Publish your build
Starter example
Adoption evidence and product-owner options

Public credibility status

Claimable

This profile now separates verified proof from self-reported claims, so founders can improve status without buying rank.

Profile strength

41/100

Claimable profile · 6 gaps

Verified Publisher

Verify ownership through DNS or well-known file.

Verified Adoption

Connect SDK/API events to prove adoption.

About LangChain4j

Java framework for integrating LLMs, RAG pipelines, tools, and agent workflows into JVM applications.

Resources
Actions
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Developers also use

Generated from similarity, co-save, category, project, and adoption signals.

LangChain logo
LangChain

RAG Frameworks· langchain.com

Open source

Framework for composing agents, RAG workflows, retrieval, and tool calls.

Why recommended

Highly similar description

Keep evaluating LangChain4j

Comparisons, category adoption data, and shortlist guides that answer the questions this profile raises next.

Weigh LangChain4j against the alternatives

  • LangChain4j alternativesEvery rag frameworks product developers evaluate in place of LangChain4j.
  • LangChain4j vs LangChainSide-by-side pricing, API surface, and adoption evidence.
  • LangChain4j vs HaystackSide-by-side pricing, API surface, and adoption evidence.
  • LangChain4j vs Crawl4AISide-by-side pricing, API surface, and adoption evidence.
  • RAG Frameworks decisions where you need a concrete shortlist.
  • Teams that prefer open-source or self-hostable options.
  • Builds that need an API-first integration path.

Watch-outs

  • Not enough verified adoption data yet.
  • Docs linked on this profile.
  • Repository linked for inspection.
  • No developer reviews yet.

Quickstart

See the profile quickstart below or open the official docs for setup instructions.

Use quickstart hereDocsGitHubWebsite

Compare alternatives

LangChain4j vs LangChainLangChain4j vs HaystackLangChain4j vs Crawl4AI
Build with this

What you would get weekly

Save or follow LangChain4j to track rank movement, new alternatives, starter examples, benchmark/docs changes, and project activity. Default cadence is weekly.

No live product opportunities yet

You can still use the workbench: build a stack, publish proof, and follow starter challenge programs. New credits, workshops, and launch programs appear here once companies publish them.

Inferred

Commercial model

Open source profile signal; exact enterprise terms need buyer review.

View source
Needs verification

Reliability

No status page, uptime, or SLA evidence attached

Needs verification

Security/compliance

No security, trust, or compliance source attached

Source linked

Integration fit

API available with docs/profile signal

View source
Needs verification

Adoption proof

No public adoption proof attached

Buyer recommendation

Shortlist only after verifying Reliability and Security/compliance.

API signal supports workflow automation.Docs are linked for implementation review.Open-source path can reduce lock-in review.At least one buyer evidence source is linked or verified.

Vendor value loop

Vendors receive anonymous aggregate evaluation demand by default. Account details are shared only after explicit buyer contact or consent.

Request vendor contact

Real data backfill while adoption proof grows

These are source-linked enrichment paths for missing fields. They are treated as proxies until claimed-company data and first-party tokens& adoption events replace them.

GitHub repository APIfreeStars, forks, license, topics, releases, default branch, repo freshness, and public contributor signal.OpenSSF ScorecardfreeOpen-source security posture checks for repos before enterprise review.npm downloads APIfreePublic JavaScript package download trends for SDK/tool adoption proxies.PyPI StatsfreePublic Python package download trends for SDK/tool adoption proxies.Product Hunt APIfreemiumLaunch timing, maker activity, and early-adopter demand signals when products launch publicly.

RAG support chatbot

Index help docs, retrieve relevant passages, answer with citations, and trace failures before shipping.

Suggested tools

PineconeQdrantLangChainLangSmith
Load docs
Embed chunks
Retrieve context
Trace bad answers
CompareStart with vector DB

Team Verified

Add founder/team proof.

GitHub

Repository linked

Docs

Docs linked

Security

Add SOC2/security/compliance proof.

Backers

Add verified backer proof.

Protocol/API

Agent-readable proof present

Freshness

Awaiting fresh proof.

Built by
L

LangChain4j team

Founder / team from LangChain4j

OSS MaintainerProtocol ReadyPending review
GitHubWebsite

Team proof is pending until the product profile is claimed.

OSS MaintainerProtocol Ready
Owner checklist

Verified domain

+15

Verify publisher ownership to remove the unclaimed status gap.

SDK/API telemetry connected

+20

Connect SDK to unlock Verified Adoption.

Proof file
ProofStateEvidence

Publisher ownership

Domain or organization claim · Live

Pending reviewUnclaimed profile45% confidence

Verified adoption

SDK/API/CRM telemetry · Pending

Pending reviewInsufficient cohort50% confidence

Category rank

AgentRank methodology · Pending

Pending reviewRank pending40% confidence

Team proof

Domain, social, and team evidence · Live

Pending reviewTeam signal exists45% confidence

Security and enterprise readiness

Docs, compliance, protocol, and readiness signals · Pending

Pending reviewSecurity proof pending38% confidence
Share and embed

Public profile card

Share the product's rank, trust state, and top badges.

Open

AgentRank trust profile

Public proof buyers and agents can trust

Claim this tool to see who is evaluating it

AgentRank

51

Public signals · ★ 13,192

Trust Score

47

observed

Category Rank

#10

RAG Frameworks · public signals

Protocols

API, SDK

Agent-readable metadata

Tracked Developers

0

Known active developer activity

Profile Status

Unclaimed

Owner action needed

Trust Registry

AgentRank evidence file
observed

Source breakdown

GitHub13,192

68% confidence

Protocol support

APISDK

Agent-readable protocol evidence raises trust and commercial readiness.

Benchmark proof

Benchmark proof pending

Attach latency, cost, accuracy, reliability, or eval evidence to unlock the performance component.

Trust gaps

Verify publisher ownership
Send SDK/API telemetry
Attach benchmark evidence

Enterprise verification can enrich evidence and export proof packages, but cannot buy rank.

Claim this tool to see who is evaluating it
Adoption over time
Last 8 weeks+233 GitHub stars in 30d · cohort private · trust 47

Timeline appears after verified events.

We do not draw a fake adoption chart before live usage, self-reported proof, or challenge activity exists for this product.

Private (N<7)

active developers

Private (N<7)

verified adoptions

Private (N<7)

retention

Next best action

Claim LangChain4j before competitors use this profile as proof.

Connect usage events, resolve developer identities, and see which accounts are evaluating LangChain4j.

Claim this tool to see who is evaluating it

Your developer adoption profile is already visible.

Claim it to verify data, add integrations, and unlock adoption intelligence on developers and accounts evaluating LangChain4j.

Claim your tool

Developer identities

See the builders behind saves, docs clicks, API calls, and retained usage.

Talk to sales

Account map

Resolve developer activity into companies, teams, and enterprise accounts.

Talk to sales

Retention cohorts

Track first API call through 7/30/90-day retention and expansion.

Talk to sales

Competitor overlap

Find developers evaluating alternatives and switching between tools.

Talk to sales

Category benchmark

Compare activation, retention, and growth against your market.

Talk to sales

Recommended actions

Prioritized DevRel, product, and sales plays based on live adoption signals.

Talk to sales

Developer identities, account mapping, retention cohorts, and competitor overlap are available on Growth and Enterprise plans.

Official siteWEBSITE

Official product homepage or source page.

DocumentationDOCS

Builder documentation or implementation guide.

GitHub repositoryGITHUB

Public source repository used for verification.

Workspace actions

Sign up to save, follow, compare, publish builds, or verify ownership.

Public links
Visit WebsiteDocumentationGitHubView Alternatives3 Resources
GitHub Stats

13,192

Stars

2,581

Forks

946

Issues

Quick Info
PricingOpen source
Open sourceYes
API availableYes
Add to Your Project
[![LangChain4j on Adoption Intelligence](https://tokensand.com/api/badges/langchain4j)](https://tokensand.com/tools/rag-frameworks/langchain4j)
LangChain4j badge previewPreview

Add this badge to your README.md to show your listing on Adoption Intelligence.

147,177
24,634
Open source
Why recommended

Highly similar description

Haystack logo
Haystack

RAG Frameworks· haystack.deepset.ai

Open source

Open-source framework for production LLM applications, RAG pipelines, search, and agentic workflows.

Why recommended

Highly similar description

26,632
3,207
Open source
Why recommended

Highly similar description

Crawl4AI logo
Crawl4AI

RAG Frameworks· crawl4ai.com

Open source

Open-source crawling and extraction framework for feeding RAG and agent pipelines with markdown, structured data, and browser-backed collection flows.

Why recommended

Same category

84,500
8,739
Open source
Why recommended

Same category

RAGFlow logo
RAGFlow

RAG Frameworks· ragflow.io

Open source

RAGFlow is an open-source RAG engine with document understanding, hybrid search, and agent orchestration for building production retrieval workflows over complex files.

Why recommended

Same category

91,190
10,811
Open source
Why recommended

Same category

  • LangChain4j vs RAGFlowSide-by-side pricing, API surface, and adoption evidence.

    • Check the adoption evidence

    • RAG Frameworks developers actually keep usingFiltered to products with verified usage events, cohort breadth, and retention.
    • AgentRank category rankingsHow every category is ordered by adoption proof, trust, and protocol support.
    • Best AI Tools for RAGShortlist guide for this category, with the tradeoffs written out.
    • Best Open Source AI ToolsShortlist guide for this category, with the tradeoffs written out.

    Own LangChain4j? Generate its adoption badge embed, or claim the profile to send verified usage events.

    Verified adoption badge

    +10

    Send enough verified adoption events to pass the cohort threshold.

    Funding, backer, or security proof

    +8

    Add funding, backer, or security evidence to qualify for higher trust badges.

    Improve profile

    Verified Adoption badge

    README and website badge backed by telemetry.

    Open
    [![Verified Adoption](/api/badges/langchain4j?variant=verified)](https://tokensand.com/tools/rag-frameworks/langchain4j)

    Top 10 badge

    Unlocks automatically when the profile enters Top 10.

    Open
    [![Top 10](/api/badges/langchain4j?variant=top10)](https://tokensand.com/tools/rag-frameworks/langchain4j)

    Team launch card

    Founder/team credibility card for launch posts and investor updates.

    Open

    Weekly momentum card

    Share rank movement and verified adoption growth.

    EnterpriseOpen
    Launch copy

    LangChain4j is live as a public adoption profile: https://tokensand.com/tools/rag-frameworks/langchain4j. Verified proof beats vanity metrics.

    Embed path: /api/badges/langchain4j?variant=verified · Profile: /tools/rag-frameworks/langchain4j

    Start building with LangChain4j
    Hackathon-readyMixed

    Inferred — verify against official docs

    One paste into Cursor, Claude, or ChatGPT. Ships your LLM the install, example, and docs excerpt so it can scaffold your project immediately.

    Preview pack
    # Building with LangChain4j

Java framework for integrating LLMs, RAG pipelines, tools, and agent workflows into JVM applications.

**Category:** RAG Frameworks
**Directory listing:** https://tokensand.com/tools/rag-frameworks/langchain4j
**Detected stack:** unknown
**Snippets derived from real docs:** no (fallback)

## Goal

I'm building a project with LangChain4j. Help me ship end-to-end in the smallest number of steps — hackathon speed, production-safe defaults. If any step below is ambiguous or the docs snippet is incomplete, ask me what I'm trying to build before writing code.

### Install
(No canonical install command detected — see docs links below.)

### First call
(No canonical example detected — ask the LLM to write one based on the docs below.)

## Docs links
- [Official Docs](https://docs.langchain4j.dev/intro)
- [GitHub](https://github.com/langchain4j/langchain4j)
- [Website](https://docs.langchain4j.dev/)

## README (excerpt)

# LangChain4j: idiomatic, open-source Java library for building LLM-powered applications on the JVM

[![Build Status](https://img.shields.io/github/actions/workflow/status/langchain4j/langchain4j/main.yaml?branch=main&style=for-the-badge&label=C
…
    Docs:Official DocsGitHubWebsite